The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 10, 2015
Filed:
Sep. 26, 2012
Applicant:
Hoya Corporation, Tokyo, JP;
Inventors:
Assignee:
Hoya Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B 5/73 (2006.01); C03C 21/00 (2006.01); G11B 5/84 (2006.01); C03C 19/00 (2006.01); C09G 1/02 (2006.01); B24D 3/00 (2006.01); A61C 17/00 (2006.01);
U.S. Cl.
CPC ...
G11B 5/8404 (2013.01); C03C 19/00 (2013.01); C09G 1/02 (2013.01); C03C 21/008 (2013.01); A61C 17/00 (2013.01); B24D 3/005 (2013.01);
Abstract
A manufacturing method of a glass substrate for a magnetic disk is provided whereby nano pits and/or nano scratches cannot be easily produced in polishing a principal face of a glass substrate using a slurry containing zirconium oxide as an abrasive. The manufacturing method of a glass substrate for a magnetic disk includes, for instance, a polishing step of polishing a principal face of a glass substrate using a slurry containing, as an abrasive, zirconium oxide abrasive grains having monoclinic crystalline structures (M) and tetragonal crystalline structures (T).